Method of making return l&#39;s



E. E. SUCK.

MHHGD 0F MARNE RETURN L'S.

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Patented naast OFFICEW EDWIN E. SIICK, OF JOHNSTOWN, PENNSYLVANIA.

` Mn'rnon or manine animan L's.

application inea septemier as, isis. serial ivo. 326,625.

To all whom t mag/ concern.'

Be it known that I, EDWIN E. Sinon, a citizen ,of the United States, residing at Johnstown, in the county of Cambria and State of Pennsylvania, have inventedl a new and useful improvement in Methods of Making Return Ls, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specication, in whichz- Figure 1 is a longitudinal section through a piece of tubing to be used in making the L;

Figure 2 is a sectionthrough the die showing the piece of tubing about to be distorted or bulged;

Figure 3 is a similar section at the coinpletion' of this operation;

Figure 4 is a section through the L after it has been bent into til-shape; and l Figure l5 is a section showingthe completed product. A

The present invention relates to forged metal return Ls and the method of making the saine. By return L is meant a U-shaped pipe fitting in which two pipes are secured to get a reversal of direction. My improved return L is entirely seamless and formed by a forging operation. Referring to the drawings, a short length 2 of seamless tubing is the material which is forged into the return L. As shown in Figure 1 the ends ofthe length of the tubing are cutl obliquely or on the bias, so as to give an excess of metal at that side of the tubing whichY is later bulged outwardly. 'llhe length of the seamless tubing 2 isbrought to a forging heat and placed between two dies Sand 4. The die 4C has a semi-cylindrical channel, while the die 3 has a semi-cylindrical channel with a cup-shaped opening 5 therein. y Two plungers 6 and 7 act on the pipe length 2 as held between the dies 3 and 4. Each plunger has a rounded nose 8 which enters the tube 2 and an annular-shoulder 9 which engages the end of the tube 2. The plungers 6 and 7 are moved from the position shown in Figure 2 to that shown in Figure 3, causing the tube 2 to bulge'out into the cavity 5 forming a hollow bulge or projection 10 in one side of the tube 2. This bulged portion 10 forms' the bend in the completed L. The tube 2 is then removed froml the dies 3 and 4 and bent into U-shaped forni, as shown in Figure 4. This bending is preferably accom- Y plished by two mandrels 1l 'which are inserted 1n the open ends of the tube andv are then brought together parallel around a spacei bar 12, as shown in Figure 4c, whereby the two parallel legs 13 of the L are formed. The legs 13 may be threaded as desired, as shown in Figure 5, if the L is to..be used for threaded pipe. lllhere are no seams whatever 1n the L. The legs 13, the bend portion let. and the bridge portion l5 of the Lare all drawn from the seamless tubing 2 by forging operations.

rlhe present invention is not limited to the illustrated details but may be otherwise einbodied within the scopeof the following claims.

l' claim: 1. IFha method of making return Ls from tubing,

comprising forming a bulge on one side of the tube and then bending the tube 1n the opposite direction vso as to form the two parallel legs ofthe L, substantially as described.

2. rlhe process of manufacturing return Ls from tubing, which consists in placing alength of tubing one side of the tube longitudinally so as to cause the metal to flow into said cavity thereby forming a bulge on one side of the tube, and then bending the ends of the tube parallel to each other so as to form the legs of the L, substantially as described.

3. The process of making return Ls from tubing, which consists in compressing a length of tubing longitudinally and simultaneously forming a bulge at one side of the tube, and then bendingtlie ends of the tube in the opposite direction to form the parallel legs of the L, substantially as described.

[i: The process of making return Ls from tubing, comp-rising placing aflength of tubing within dies having a cavity at one side of the tubing, inserting plungers in the open ends of the tubing, and bringing them towards each other so as to longitudinally compress the tubing, whereby the tube is caused to bulge into said cavity, and thereafter bending the tube into U-shaped form around a spacer member while preventing collapsing of the end portions of the tube, substantially as described.

5. The process of making return Ls from tubing, which consists in placing a length of tubing within dies'having a cavity at one in dies having a cavity atk tube and compressing the los i side ot the tubing, inserting plungers in theopen ends of the tubing and bringing them toward each other so as to longitudinally compress the tubing, whereby the tube is caused to bulge into said cavity, and thereafter bending the ends of the tube in a direction away from the bulge so as to form lthe parallel legs of the L, substantially as described.

6. The recess of making return Ls from tubing, w ich consists in placing a short length of tubing having one side longer than the other vvithin dies having Aa cavity at the longer side of the tube, and compressing the tube longitudinal] so as to cause the metal of the longer si e of the tube to iow.

EDWIN E. SLICK. 

